How can I restore audio? LXLE/Ubuntu 16.0.4 LTS

I installed the latest LXLE on my desktop and laptop last week after my previous OS failed. Audio on my laptop randomly stopped working yesterday. I am not sure what caused it--I spent most of the day writing an essay for my class. That evening when I decided to play some white noise, nothing would come out. Guayadeque Music would show audio is playing, and PulseAudio detects the laptop's hardware audio (though it doesn't register any headphones I plug in) like normal. No sound plays, though. I have confirmed audio is not muted. It is not only an issue with Guayadque because I have tried playing audio with it, Vivaldi, Seamonkey, VLC, and other apps.